†family Cyrtonellidae Knight and Yochelson 1958 (mollusk)

Tergomya - Cyrtonellida - Cyrtonellidae

Synonym: Isospiridae Wängberg-Eriksson 1964

Full reference: J. B. Knight and E. L. Yochelson. 1958. A reconsideration of the Monoplacophora and the primitive Gastropoda. Proceedings of the Malacological Society of London 33(1):37-48

Parent taxon: Cyrtonellacea according to G.P. Wahlman 1992

See also Bouchet et al. 2005, Knight and Yochelson 1960, Ponder and Warén 1988, Starobogatov 1970 and Wagner 2017

Sister taxa: Cyclocyrtonellidae, Multifariidae

Subtaxa: Cyrtonella Isospira

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Ecology: slow-moving low-level epifaunal grazer

Distribution:

• Devonian of United States (9: New York collections)

• Silurian of the Czech Republic (1)

• Ordovician of Estonia (2), Sweden (1), the United Kingdom (1), United States (2: Tennessee, Virginia)

Total: 16 collections each including a single occurrence

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